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Dynamic band-allocating subscriber-line-terminating apparatus

a subscriber-line termination and dynamic technology, applied in the field of subscriber-line termination apparatus, can solve the problems of inability to meet the needs of a large buffer memory size, inability to use the transmission band with a high degree of efficiency, and inability to keep up with the case well

Inactive Publication Date: 2001-10-11
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this conventional technique is not capable of well keeping up with a case in which traffic occurs irregularly as a burst as is the case with data traffic.
With this method, however, polling operations at few bursts will be all wasted so that the transmission band cannot be used with a high degree of efficiency.
In this case, however, a buffer memory with a very large size is required.
However, the conventional method has the following 3 problems.
However, an ONU with a small in-buffer-information amount is not in a state of communicating no information.
The vibration of the size of an allocated band portion causes a fluctuation and a delay in arrival time of information.
In the case of such traffic, information leaks in a small-size buffer existing on a transmission line, causing the quality to deteriorate.
In addition, the qualities of connection sharing the buffer and the transmission line also deteriorate as well.
For this reason, the SLT must be provided with means such as a buffer with a large size for absorbing vibrations prior to transmission to a network, and such a buffer raises the cost of the SLT considerably.
In addition, a fluctuation and a delay resulting from a vibration substantially deteriorates the quality of a real-time service such as a service of providing sounds and motion pictures.
The problem encountered as a big vibration of a size of a band portion allocated to an ONU is attributed to the fact that the size of a band portion to be allocated to the ONU is simply set at a value proportional to the in-buffer-information amount without computing a correct size of a band portion to be allocated from the in-buffer-information amount.
As a result, band portions are not allocated fairly.
With the conventional technique, however, this scheme is impossible.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0087] First Embodiment

[0088] FIG. 4 is a functional block diagram showing an ATM-PON IF unit 40 and an ONU 26#ij, which are implemented by a first embodiment of the present invention. As shown in FIG. 4, the ATM-PON IF unit 40 comprises a polling-request-extracting unit 70, a shared-band control unit 72, an ONU-common-parameter management table 74, an ONU-specific-parameter management table 76, a shared-band-polling-information-generating unit 78, a fixed-band-polling-information-generating unit 80, a shared-band-polling-information buffer 82, a fixed-band-polling-informati-on buffer 84, a polling-information-multiplexing unit 86 and a descending-information-multiplexing unit 88. In this embodiment, the ATM-PON IF unit 40 terminates lines from a plurality of ONUs 26#ij shown in FIG. 3 where i=1 or 2 and j=1 to n.

[0089] The polling-request-extracting unit 70 extracts ascending information from an ascending information frame received from an ONU 26#ij, and extracts an in-buffer-infor...

second embodiment

[0132] Second Embodiment

[0133] FIG. 12 is a functional block diagram showing an ATM-PON IF unit 129 implemented by a second embodiment of the present invention. Components of the second embodiment virtually identical with those employed in the first embodiment shown in FIG. 4 are denoted by the same reference numerals as the latter. The ATM-PON IF unit 129 implemented by a second embodiment is different from the ATM-PON IF unit 40 implemented by the first embodiment in that, in the case of the second embodiment, an upper limit is set for an individual shared band portion allocated to each of the ONUs 26#ij where j=1 to n, and an individual shared band portion allocated to an ONU 26#ij is always set at a value not exceeding the upper limit. By the same token, a shared-band control unit 130 implemented by a second embodiment is different from the shared-band control unit 72 employed in the ATM-PON IF unit 40 shown in FIG. 4 in that the shared-band control unit 130 limits an individual...

third embodiment

[0149] Third Embodiment

[0150] FIG. 16 is a functional block diagram showing an ATM-PON IF unit 149 implemented by a third embodiment of the present invention. Components of the third embodiment virtually identical with those employed in the second embodiment shown in FIG. 12 are denoted by the same reference numerals as the latter. The ATM-PON IF unit 149 implemented by a third embodiment is different from the ATM-PON IF unit 129 implemented by the second embodiment in that, in the case of the third embodiment, if an insufficient band portion computed from an in-buffer-information amount for any of the ONUS 26#ij where j=1 to n is greater than a first threshold value but smaller than a second threshold value, the insufficient band portion is raised to the second one.

[0151] In the case of TCP traffic, flow control among user terminals is executed. Thus, an in-buffer-information amount does not show a polling count for the insufficient band portion. In TCP traffic, flow control among ...

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Abstract

A subscriber-line-terminating apparatus for dynamically allocating band portions to a plurality of terminal apparatuses includes an in-buffer-information-amount receiving unit for receiving an in-buffer-information amount from each of the terminal apparatuses; an insufficient-band-computing unit for computing an insufficient band portion required by each of the terminal apparatuses; an in-buffer-information-amount-proportional-band-allocating unit for allocating a band portion corresponding to the in-buffer-information amount to each of the terminal apparatuses and a past-use-band-allocating unit for allocating a past-use band part to each of the terminal apparatuses as a past-use band portion based on a first past-use band variable of the terminal apparatus. Further a subscriber-line-terminating apparatus includes a first past-use-band-variable-updating unit for updating the first past-use band variable for each of the terminal apparatuses on the basis of a band portion dynamically allocated to the terminal apparatus; a shared-band-polling-information-generating unit for generating polling information showing allocation of time slots to the terminal apparatuses; and a polling-information-transmitting unit for transmitting the polling information to the terminal apparatuses.

Description

[0001] 1. Field of the Invention[0002] In general, the present invention relates to a subscriber-line-terminating apparatus. More particularly, the present invention relates to dynamic allocation of a band required for transmission of information to optical network units.[0003] 2. Description of the Related Art[0004] ATM-PON is an access communication system making use of characteristics of both an ATM (Asynchronous Transfer Mode) technology and a PON (Passive Optical Network) technology. The ATM technology makes integrated processing possible by dividing a variety of multimedia services of various kinds such as sounds, pictures and data into cells each having a fixed length. On the other hand, the PON technology makes a system cost low by letting a plurality of users share an optical transmission facility. An ATM-PON system comprises, among others, a subscriber-line-terminating apparatus (abbreviated hereafter to an SLT) installed typically at a telephone office, a plurality of opt...

Claims

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Application Information

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IPC IPC(8): H04L47/76H04Q11/04
CPCH04L2012/5605H04L2012/561H04L2012/5632H04Q11/0478
Inventor SHIMADA, NAGAOSHINOMIYA, TOMOHIROMIYABE, MASATAKEYAMASHITA, HARUO
Owner FUJITSU LTD